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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b4ee8dbbfb99caa0c1fb0d40e4a3f7a14917986ee95c0876158ef952b66a742' 
  AND token = 'Fb3I/7kpC4CT37ySrZOlR6CmDIv0hwK6W0wVADgl6tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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