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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93256a64d102df0442c11ba486eae348904aaac8c9ecb00c4c3171bf323d10df' 
  AND token = 'SGeSIeNiBDeDN/kDfMAcClmKxKNr5YycEDKFWjO+e2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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