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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d47455c0fe7953704e9c0c2517a807f9011bdc78d8688c0d800a6e99cc1fc8e' 
  AND token = 'SAZy5TR1DEKHmjlXKNKLq9Bp3v2KhKQo4q+QGe9ZF5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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