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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6cb92218de605a68678a6d442cada4b7d61171e6e24e0f3437da55b1176aee' 
  AND token = 'Bu79ss+hINYh/j4vz2C5katd82mFgj2h774QWC4BkwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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