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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf31c10799106908803775dc618fa658de9c8624c00bb9c1fe2505032cc695a' 
  AND token = 'kI9//vyCmtDkQtgr3JhTvFY4AbpxQoCb6yzxzKDXFlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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