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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5435aa8761bc5d5bf5665a3349a29a0e73933b96c67603e33eb5d96e94b2c2b' 
  AND token = 'vh48UxiYpzObUBa4RUSf7YrPXd2wsros/S+2F/VfgC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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