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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963b6a3c8266d45b93b58407d7baab1e1d0c22b9b2a6473073356344bb32633f' 
  AND token = 'Gim++uAG0iRIvMfykHSF5wE9oyP1BY46UPJk10RVdow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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