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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d265e63ee207cddda3152b7d77833aa7e5b69ea3cb671efd40784f298828786' 
  AND token = 'phnpkI76Wjx+ETp6TB31+G6gJG16PcP0yqzH4yhazMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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