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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e69b591ae1c489bf1a66ee00534382ba63011443f2d04bf5cef6823d29904c' 
  AND token = 'tsvv4lnqCMOeY4oegugBbA7xLxEpyggRweSTf9ElPNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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