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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb36f0d5437b8f7ecce2719c6569a7bb3746d0a96f9d6e02815ff65c97011ec4' 
  AND token = 'x9QcaVGf0G3QsMgTTJk3CaGynxvsj06pDijA0DRWRCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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