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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb3730be8cf9a67ad9d731c8d4398ab6fd9f9e5009b984cc16ed7becb71038d' 
  AND token = 'dueG2zJpElbrPz9yd1KcjU1vogujgFQI6SzH5jfozAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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