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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c3246d9347f8eb682581f7d4a54169ef2ae9ea6f1ac56ae72e051c154179e3' 
  AND token = '2t2jhvrxuOw6zmdCpu2GIpAfdYUwyVHSu6HBAAJO6To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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