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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933a23b31f5d82f8648a2de385daae814823bbf7fd77b71d96c0dbbac9abf5fc' 
  AND token = 'dul9cOQA+F677HxmxOvF/uG1gd+c+1xKq6C1sD+9a4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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