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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b866dcd84676a360f7b86bd13d08cd8494a369834d88d15082f61fca1ef10b' 
  AND token = 'wjAHpy7+rcmE6GN7/z8qUqlSZvzTn+iGlneQC1w4bRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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