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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef57e0ac84b2f2d48f5e20f7569bb68bf39b5a79c0bea94b56510830d77dff8c' 
  AND token = 'E8WwpS0qyaii2dBU6DZqblc7kYmw9DuwgIpbgyQeUYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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