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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938c209daa751a82ba5f650d36024124787281bdc0119d03ae59d6b5466445b5' 
  AND token = '1oa82qus1CrXsTQdgQG7O8DHrW5E97p/OEGP1cUdqdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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