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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aaa952d05e3d6316a19c8f136835b39a43d34c7d6d017fce01294d3f610ce33' 
  AND token = 'lJI4DlzhzrjSg2xxqBTVx8gxw58IjJbpSANpicLDsu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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