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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e1cfaffeb50925bd961dbbb1c923f1c4617cee55f21fa6b9af81f7cedd1e18' 
  AND token = 'Ety1/WwtrTFdcSRMp3eWaSrJbIoixz+/0GrVdTLTU54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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