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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c3e3385180c8c289a13b5138c885807fb15d33411ddd27c3bfb2d417f5b698' 
  AND token = 'BV2YYIjuUjAPI9U++ARiX6lT9SWgipy15frfgBODp4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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