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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0e4b8ae4527ec27e03cd38da1320e3e5b6f3e95480c8ccb74fc48a8526a711' 
  AND token = 'ofKCECmhAqEFKqqDpSYxQ7JrPk3Tgyz99YKESxtdbfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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