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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e759cd532d4cefab0d61709899f69a142c6ec9f9b22bb4ccf8c594cf6342b73f' 
  AND token = 'Q+VwSirfw+zraoUu9VcT03Vf6UeuZiIincC/uFAYxkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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