SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14bbed39d697e673292032e1b2bea44391f326cadaf1f8356d448d6356efc1ff' 
  AND token = 'zmbpviC56l3FHoNYpxqXV+snjXigbBBQRiaPSpvGPMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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