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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2f6c90b6186df86ba921234997608267dad51bea1e4452aaa349b821711f7b' 
  AND token = 'L+LZE4mN8D9N00FzTONu4c6Afy9tYaPGXqYWW7RyXQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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