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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba6c4f8310ce8e53bf903dcd5416a6877c9262b8feeb3269809fdcf81194ff6' 
  AND token = '19UZHG3oJqiyzhf4ds3vYTXnxstyeZD5bP+qYjrU0+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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