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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b107e72d99f5df12f5c97a32f38d16de8f655ea36ca733a03acb69542fb7403c' 
  AND token = 'jT3i31N7QByT6mELvVcClOZi5o/OLRxW2e7cdcMnwy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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