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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b131933dc38e3ed2e50ef0d6ef90c8bcb037545f8f9db1f18b4ba9a6b8fc7c8e' 
  AND token = 'DoJxbaM0qLm6tgGjTUqA3LeI98E8Iu7af5nkOyCbG48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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