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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367d421572f2c09faac7e54b8768df7c7428fee79d9495dea765be32534d68ae' 
  AND token = 'zx4aAw5udfr6K2G3Um4pCRfQHh5ANl6IsMbUnXJ08WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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