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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6147060915f08d7198cef521fa540492a7754cfdd18da2b7bd14b6b838c96b' 
  AND token = 'kjMD9q9sbvbujnvit+M1nKLxDXi6//+d+DpwggMaLWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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