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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ed9175d26171b3ceefaa461ca8ca3de53fd53a9a7be2ac179f6f3a537bb595c' 
  AND token = 'N3gU12bhBtgUefPos+0/eUwZttE4nykJmSS5m4FVOQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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