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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cd3ef19f87287a6cb258aeaf61b3978da6e6f0e34ed1a881723b4f2abfe3b0' 
  AND token = 'GB9EE5y451SWdlcIqS+RJwMdQYewoQBl+92dOvwbjqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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