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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a611d0642bedcb5d389232a0e1425a7abbb91edf34f08f6b2bd2d845552d9331' 
  AND token = 'QnI09WRF5CrTa5oLrgPERKJzBKTKcxhitoztITPBeh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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