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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7418e36fc6a7f13b5c5b060a25cb0fc8a27b7a3d1b91c4cad6da7b5610c4b5e5' 
  AND token = '6yqK5w0R8Gh55VcghKQYFCZTfDOycEfHSJLlRsJrJno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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