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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc93e184087d391f2e76424e7b3250b62281e394ab98c5e95c78611817ba06fc' 
  AND token = 'bih0MDyC+0IDGpscAbsDGgygsYRD9d1ahxHLptZ6B24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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