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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530974f4a4a8df45554fc3452f2d46e8da57aea25f3030e85884fdbd4cc59e02' 
  AND token = 'vxV7xiKcYb/7lLcXM8jYakS9BOxjou01WDOJe+NiOoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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