SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f5e2a9dc7a5c03922bde57bd42c8f662618dfcdac6bc31067fab3fd2e3847a' 
  AND token = 'adgZYglo1wZ/xV8Un9bIzodBNuTMQGKCHariZhY/aOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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