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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b07caeefc28dc410b0a60c937f6c415a58285275afe7ba64ac4cbb6ad24ba1' 
  AND token = '7LbGuccVPlta44uYMgDJeVlvZ6OsbExt720PgO0oNSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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