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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9308b6cc5f0f5f156d884737c81f0ea863925ff75ee378d7b11893fcf3a8f6e6' 
  AND token = 'XBovZ0ZIDZNvg6JiQnuHAYMfG0e/Q6uA80byxBu4CC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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