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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '180a8eaec41f37723f27590b5a71155b8457b1e9041f60611fb9420aee240e53' 
  AND token = '9gvC2Xp67z6r4QluFlgSzjUvcBnrzHDI4/9RYa3H3OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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