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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b103edcb42a8ecdc9ec7ca648704922961981e4c5fc9df796932bf3109a50d' 
  AND token = 'G2jZQf38RqUV21by6n4xCDY188gNzDxe3Ed9pNI5UWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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