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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd252fa215cf28d264d15d86cec57085a70d677c90330e8e87cb6b0ee56247893' 
  AND token = 'r9YUaiP+ORsBP861/VibC9sa5ULS9hpimkXeJ6qm3b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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