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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff450344cccb0949a4867d1e7236048dc83f074656b91ee62f386350224bca3' 
  AND token = 'mF8fne9S93rUbW2yJdscn9W+IHJbLR+i1IfuQzGoFM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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