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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f696d077987fd1cc7a5942ec8aecb70a4187e765c4f4292865f6b88230890a79' 
  AND token = 'WEAa6CHi6Cy8vbM4K5SMvXiGeNn5NOVa9LwcBEhgmfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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