SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf349f5d45857b0559abab57c2e658f4c4f64a7263c78f69803ce946283b5d6' 
  AND token = 'hAXKaELPwjU0Tj4V0Um1b3ZQdLA/VanYqtUFa+sRaBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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