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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368e392dc1ca4ae41b1ec01578b5343ec33db866f53dfab2b3e501ee3b17091e' 
  AND token = 'd6qcIXYhu0eSOeziEGq/V6skZT8FWTGtxVcRNZTAmyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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