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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c894ef8fdfb4010771dcc23426b3bd30c42170738053ce660b25dcd4b7dac7bf' 
  AND token = '7QNJBR+bN3eR+ComYfMj8bR2PdWSLn2bD8/h4TP/+5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}