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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16bf8e1fa31b8ae83f81b20505e077b1737337d190368d80f8247cf54b1bcb7' 
  AND token = 'q8PzSb6atpgO6GdtQW2OD6bZAJaaY4+ThyZa4aXV0JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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