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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db844a9d5b5f6f2fa65bec1311eb26be58ea0dc406a58d4de46e4087b880e84' 
  AND token = 'URWdGcxudYt568f2rB1UnK5o8Pp/twGbNzBY4UnpIYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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