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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd312c8db8c1da285b832f9b4f8876b65b238b87a69b87fcec18d61a220448c92' 
  AND token = 'pZzxl3UbqnRnlsh3/FmCsQVsR6BvUZq0aZMuCz9EZ4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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