SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ed4e2f03649590b7ca8393520b4506912266cf37bde61531ab9f1cdd43aae3' 
  AND token = 'LuTfb7OXDUtGGPFy5JjjPzjJHyrW+fVzZFJz1lOEjUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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