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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c18ca93176ec094ebe85ed5ac8168fe410d22115a0c32bad8910ac19d39606fa' 
  AND token = '5krvkViOWBx1985t8BnAjzzjBDWiO1O1wSR8t+n5hzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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