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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d55dc7c60bd9bd84ceb6de20e6c467ee6d3240e3fd5cb634be8c79b39ef1c8' 
  AND token = 'woqzV1ThwbgTNdt7csdHVEtZN4fGmSXZEVieHSJyZjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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