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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b655513c28f547a16017623b3e575d24c188efd1b669debae542ac74d66472f' 
  AND token = 'hlGYN3mFnRakkF1F3tqed+rj/4iQtiWOWFvZMF0CNnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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