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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97289693944b69d2e28e564139afad6bba2d6119b2a3289e1aa3bb911bf9fe54' 
  AND token = 'hFJelp4CpYTyyBdRG5AT6XG70/t4LZTV/57UoLNh2AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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