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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f836434a4f0124150d24c3a171400010160cd500cb668e62f3b4f97984d11be7' 
  AND token = 'aJSzWfLVfdFkaPHtNDZzGgN7bw7VmNBDURFUqYiUav4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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