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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3248af4242f7e8d6d6a195839d2ac6f57de93529be3e049eabdd44c72ba79738' 
  AND token = '7xv9l7/2T8c/a46eP+B3M+LqankYV36LwR/UpQdfmFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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