Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e12254365784664c13945dd0200425ad22c2b3cefdc6c81df0bee893c37c5e' 
  AND token = 'O36YMnheHKdV0NBfUmWEI04PkSwioFdNpaHM7s0Dk5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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