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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d086b15256b4d54be98e071cae90c9304a8dc59e8062eada3f405e4c2605b4' 
  AND token = 'ywc79FurSzD8UEz5Svr/GlOhdCtkkjO6TrsKAguLknk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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