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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799cb5b03f954141cb822f50921b68625cbd0609342509d54cf9c7eb21303ed5' 
  AND token = 'B47S4Yde4CFlRyuwnOL4avVsogebRMnih+cC4IstY9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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