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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a7190d6f3f7749f2130b6140e9a9bd8690b71567bd9ebad9846639734f390a' 
  AND token = 'lqls+ahfuXNT9ayVN/b+0pWeJa7TGoCfXu0EsEJQFio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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