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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3dfca39474b72af01a886b2b7a69aaae5e41a9bc2a3d9771430db1937034fc' 
  AND token = 'ueAl9dhrmw2rSUMcRa8Q1c0tsO1/bvTYLv2+zU1MLgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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