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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32267bf4127219ec46709141f04d4bd773c54d754b536b8170d5954fbbc17e4b' 
  AND token = 'kxRakhAW5A+3RY/cxw2V0FTYSP+qitaFhKG6wd+K5wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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