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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd0b62db7add80b8c8024bb02bb58dea5850a4bb6a7828e5a26979e5ca44312' 
  AND token = '5ZKZ92LCaiqRQ3Ra9Ubn0nVpL8L+nwSXskyNOhRLOe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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