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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa4bce3489ab6678a701fd912643e9bd47ece5feeda79fd81f78e96e134aece' 
  AND token = '0obvY2CzaAbYv7Lwt16sTpRlK6l7FSCqlFCgaC875C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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