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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f60816939b76e45f53eccfb57373be0adc45f6a4b815faa06fc59b4a36c6d35' 
  AND token = '4M744kRHdvJ7D6abTlCal7EC9DMxl8P4hYNBS8DBVx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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