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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a98ee8f868476a86f5b8fdc2a832ba548e6bc49cdccea575a4a8602bbf72cc5' 
  AND token = 'g/r+WqN7cn16f1SUeuQ2+e7SrwB3UzKA1zIGz6I2/ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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