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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5d08745b3ba4863a20361cae45ad73df5ac2c3951d1be2a4a5a2db7e4dcd83' 
  AND token = '99IKjrcdEu8TzRzlM2RnL1V2bFFnpxIj9nep7GbfmZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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