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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd398ecd683b0ee4f2ff0d24f4f91963bc360a73f2edf464800481e6a25930c50' 
  AND token = '+wIQvOlcNopkkSncH2XOVYvw5It5dkWL0PXI1Pvlil4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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