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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8df798985c50597f55c5ac89bb60dbc08d4e1efa3ec1a7ee39311367e30c6e4' 
  AND token = '1oEDIJKXQcntigfNTpZxWDP02aM1R5oPfeFtJyH8nBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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