SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da61f6d4421122570b326ebfd9698cec8726c97450b6f899cfc98df1a1a2e07' 
  AND token = 'iqB/g/YKgkfZrh+p568/P0M0j67VEOgSLy//Ic2MQXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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