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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f2d5caf1729c0f25a74c6ddd445aa46ecb2304fdac69dee552d4b52ba51b0f' 
  AND token = 'U79fj12wiKpdbPO5YUMWRX7rIt8EPrR1Y/qqNEkUgNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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