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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48af40755c4373e863a370522ea23f363860981d6d9496d32667cea2adfeba60' 
  AND token = 'XhXpmWnxHkot4WFBwJvOgtXt1UU/S+AWtPMDTZekiHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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