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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71c7c2f69608a9271fdeef87940017297e6ebbd7923cf830463b63f35d44990' 
  AND token = '8tZWRccH2kPAt48kvH++1kIfK2kZ5kRkVhWJNVNTUl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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